EventQtSlotConnect
vtk-examples/Cxx/Qt/EventQtSlotConnect
Question
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Code¶
EventQtSlotConnect.cxx
#include "EventQtSlotConnect.h"
#include "ui_EventQtSlotConnect.h"
#include <vtkEventQtSlotConnect.h>
#include <vtkGenericOpenGLRenderWindow.h>
#include <vtkLookupTable.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkPlatonicSolidSource.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkVersion.h>
#include <iostream>
#include <string>
#if VTK_VERSION_NUMBER >= 89000000000ULL
#define VTK890 1
#endif
namespace {
/** Get a specialised lookup table for the platonic solids.
*
* Since each face of a vtkPlatonicSolidSource has a different
* cell scalar, we create a lookup table with a different colour
* for each face.
* The colors have been carefully chosen so that adjacent cells
* are colored distinctly.
*
* @return The lookup table.
*/
vtkNew<vtkLookupTable> GetPlatonicLUT();
} // namespace
// Constructor
EventQtSlotConnect::EventQtSlotConnect(QWidget* parent)
: QMainWindow(parent), ui(new Ui::EventQtSlotConnect)
{
this->ui->setupUi(this);
vtkNew<vtkNamedColors> colors;
vtkNew<vtkGenericOpenGLRenderWindow> renderWindow;
#if VTK890
this->ui->qvtkWidget->setRenderWindow(renderWindow);
#else
this->ui->qvtkWidget->SetRenderWindow(renderWindow);
#endif
vtkNew<vtkEventQtSlotConnect> slotConnector;
this->Connections = slotConnector;
auto lut = GetPlatonicLUT();
vtkNew<vtkPlatonicSolidSource> source;
source->SetSolidTypeToOctahedron();
vtkNew<vtkPolyDataMapper> mapper;
mapper->SetInputConnection(source->GetOutputPort());
mapper->SetLookupTable(lut);
mapper->SetScalarRange(0, 19);
vtkNew<vtkActor> actor;
actor->SetMapper(mapper);
vtkNew<vtkRenderer> renderer;
renderer->AddActor(actor);
renderer->SetBackground(colors->GetColor3d("SteelBlue").GetData());
#if VTK890
this->ui->qvtkWidget->renderWindow()->AddRenderer(renderer);
#else
this->ui->qvtkWidget->GetRenderWindow()->AddRenderer(renderer);
#endif
#if VTK890
this->Connections->Connect(
this->ui->qvtkWidget->renderWindow()->GetInteractor(),
vtkCommand::LeftButtonPressEvent, this,
SLOT(slot_clicked(vtkObject*, unsigned long, void*, void*)));
#else
this->Connections->Connect(
this->qvtkWidget->GetRenderWindow()->GetInteractor(),
vtkCommand::LeftButtonPressEvent, this,
SLOT(slot_clicked(vtkObject*, unsigned long, void*, void*)));
#endif
};
EventQtSlotConnect::~EventQtSlotConnect()
{
delete this->ui;
}
void EventQtSlotConnect::slot_clicked(vtkObject*, unsigned long, void*, void*)
{
std::cout << "Clicked." << std::endl;
}
namespace {
vtkNew<vtkLookupTable> GetPlatonicLUT()
{
vtkNew<vtkLookupTable> lut;
lut->SetNumberOfTableValues(20);
lut->SetTableRange(0.0, 19.0);
lut->Build();
lut->SetTableValue(0, 0.1, 0.1, 0.1);
lut->SetTableValue(1, 0, 0, 1);
lut->SetTableValue(2, 0, 1, 0);
lut->SetTableValue(3, 0, 1, 1);
lut->SetTableValue(4, 1, 0, 0);
lut->SetTableValue(5, 1, 0, 1);
lut->SetTableValue(6, 1, 1, 0);
lut->SetTableValue(7, 0.9, 0.7, 0.9);
lut->SetTableValue(8, 0.5, 0.5, 0.5);
lut->SetTableValue(9, 0.0, 0.0, 0.7);
lut->SetTableValue(10, 0.5, 0.7, 0.5);
lut->SetTableValue(11, 0, 0.7, 0.7);
lut->SetTableValue(12, 0.7, 0, 0);
lut->SetTableValue(13, 0.7, 0, 0.7);
lut->SetTableValue(14, 0.7, 0.7, 0);
lut->SetTableValue(15, 0, 0, 0.4);
lut->SetTableValue(16, 0, 0.4, 0);
lut->SetTableValue(17, 0, 0.4, 0.4);
lut->SetTableValue(18, 0.4, 0, 0);
lut->SetTableValue(19, 0.4, 0, 0.4);
return lut;
}
} // namespace
EventQtSlotConnect.h
#ifndef EventQtSlotConnect_H
#define EventQtSlotConnect_H
#include <QMainWindow>
#include <vtkObject.h>
#include <vtkSmartPointer.h>
// Forward class declarations
class vtkEventQtSlotConnect;
/*
* See "The Single Inheritance Approach" in this link:
* [Using a Designer UI File in Your C++
* Application](https://doc.qt.io/qt-5/designer-using-a-ui-file.html)
*/
namespace Ui {
class EventQtSlotConnect;
}
class EventQtSlotConnect : public QMainWindow
{
Q_OBJECT
public:
explicit EventQtSlotConnect(QWidget* parent = nullptr);
virtual ~EventQtSlotConnect();
public slots:
void slot_clicked(vtkObject*, unsigned long, void*, void*);
private:
vtkSmartPointer<vtkEventQtSlotConnect> Connections;
// Designer form
Ui::EventQtSlotConnect* ui;
};
#endif
EventQtSlotConnect.ui
<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
<class>EventQtSlotConnect</class>
<widget class="QMainWindow" name="EventQtSlotConnect">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>561</width>
<height>575</height>
</rect>
</property>
<property name="windowTitle">
<string>EventQtSlotConnect</string>
</property>
<widget class="QWidget" name="centralwidget">
<layout class="QHBoxLayout" name="horizontalLayout">
<item>
<widget class="QVTKOpenGLNativeWidget" name="qvtkWidget">
<property name="sizePolicy">
<sizepolicy hsizetype="Expanding" vsizetype="MinimumExpanding">
<horstretch>0</horstretch>
<verstretch>0</verstretch>
</sizepolicy>
</property>
</widget>
</item>
</layout>
</widget>
<action name="actionOpenFile">
<property name="enabled">
<bool>true</bool>
</property>
<property name="text">
<string>Open File...</string>
</property>
</action>
<action name="actionExit">
<property name="text">
<string>Exit</string>
</property>
</action>
<action name="actionPrint">
<property name="text">
<string>Print</string>
</property>
</action>
<action name="actionHelp">
<property name="text">
<string>Help</string>
</property>
</action>
<action name="actionSave">
<property name="text">
<string>Save</string>
</property>
</action>
</widget>
<customwidgets>
<customwidget>
<class>QVTKOpenGLNativeWidget</class>
<extends>QWidget</extends>
<header>QVTKOpenGLNativeWidget.h</header>
</customwidget>
</customwidgets>
<resources/>
<connections/>
</ui>
EventQtSlotConnectDriver.cxx
#include <QApplication>
#include <QSurfaceFormat>
#include <QVTKOpenGLNativeWidget.h>
#include "EventQtSlotConnect.h"
int main(int argc, char** argv)
{
// needed to ensure appropriate OpenGL context is created for VTK rendering.
QSurfaceFormat::setDefaultFormat(QVTKOpenGLNativeWidget::defaultFormat());
QApplication app(argc, argv);
EventQtSlotConnect eventQtSlotConnect;
eventQtSlotConnect.show();
return app.exec();
}
CMakeLists.txt¶
cmake_minimum_required(VERSION 3.12 FATAL_ERROR)
if(POLICY CMP0020)
cmake_policy(SET CMP0020 NEW)
cmake_policy(SET CMP0071 NEW)
endif()
PROJECT(EventQtSlotConnect)
find_package(VTK COMPONENTS
GUISupportQt
RenderingQt
)
if(NOT VTK_FOUND)
message(FATAL_ERROR "EventQtSlotConnect: Unable to find the VTK build folder.")
endif()
if(NOT(TARGET VTK::GUISupportQt))
message(FATAL_ERROR "EventQtSlotConnect: VTK not built with Qt support.")
endif()
if(NOT DEFINED VTK_QT_VERSION)
set(VTK_QT_VERSION 5)
endif()
set(qt_components Core Gui Widgets)
if(${VTK_QT_VERSION} VERSION_GREATER_EQUAL 6)
list(APPEND qt_components OpenGLWidgets)
endif()
list(SORT qt_components)
# We have ui files, so this will also bring in the macro:
# qt5_wrap_ui or qt_wrap_ui from Widgets.
find_package(Qt${VTK_QT_VERSION} QUIET
REQUIRED COMPONENTS ${qt_components}
)
foreach(_qt_comp IN LISTS qt_components)
list(APPEND qt_modules "Qt${VTK_QT_VERSION}::${_qt_comp}")
endforeach()
message (STATUS "VTK_VERSION: ${VTK_VERSION}, Qt Version: ${Qt${VTK_QT_VERSION}Widgets_VERSION}")
# Instruct CMake to run moc and uic automatically when needed.
set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTOUIC ON)
include_directories(${CMAKE_CURRENT_SOURCE_DIR} ${CMAKE_CURRENT_BINARY_DIR})
file(GLOB UI_FILES *.ui)
file(GLOB QT_WRAP *.h)
file(GLOB CXX_FILES *.cxx)
# For VTK versions greater than or equal to 8.90.0:
# CMAKE_AUTOUIC is ON so we handle uic automatically for Qt targets.
# CMAKE_AUTOMOC is ON so we handle moc automatically for Qt targets.
# Prevent a "command line is too long" failure in Windows.
set(CMAKE_NINJA_FORCE_RESPONSE_FILE "ON" CACHE BOOL "Force Ninja to use response files.")
# CMAKE_AUTOMOC in ON so the MOC headers will be automatically wrapped.
add_executable(EventQtSlotConnect MACOSX_BUNDLE
${CXX_FILES} ${UISrcs} ${QT_WRAP}
)
if (Qt${VTK_QT_VERSION}Widgets_VERSION VERSION_LESS "5.11.0")
qt5_use_modules(EventQtSlotConnect ${qt_components})
else()
target_link_libraries(EventQtSlotConnect ${qt_modules})
endif()
target_link_libraries(EventQtSlotConnect ${VTK_LIBRARIES})
# vtk_module_autoinit is needed
vtk_module_autoinit(
TARGETS EventQtSlotConnect
MODULES ${VTK_LIBRARIES}
)
Download and Build EventQtSlotConnect¶
Click here to download EventQtSlotConnect and its CMakeLists.txt file. Once the tarball EventQtSlotConnect.tar has been downloaded and extracted,
cd EventQtSlotConnect/build
This example requires Qt and VTK.
If VTK and Qt are installed:
cmake ..
If VTK is not installed but compiled on your system, you will need to specify the path to your VTK build:
cmake -DVTK_DIR=/home/me/vtk_build ..
If Qt is not found on your system, you will need to tell CMake where to find qmake:
cmake -DQT_QMAKE_EXECUTABLE:FILEPATH=/usr/something/qmake ..
Build the project:
make
and run it:
./EventQtSlotConnect
WINDOWS USERS
Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time. You may also need to add a Qt related path.